You work as a network exchange administrator at company.com.the company.com network currently consists of a single active directory forest containing a single domain named company.com.the company.com organization makes use of microsoft exchange server 2010 as their messaging solution.thecompany.com organization currently makes use of a computer named -ex01.during the course of the business week you receive instruction from company.com to configure a retention period of 30 days for all deleted message items whilst ensuring that each item which passes the retention period are removed between 3：00 and 5：00 on a daily basis. What should you do？（）

A. you should consider having the maintenance schedule of king database changed for the retention and removal of message items.
B. you should consider having the messaging record management （mrm） schedule for-ex01 changed for the retention and removal of message items.
C. you should consider having the set-retention policy cmdlet run to schedule the retention and removal of message items.
D. you should consider having the start-managed folder assistant cmdlet run to schedule the retention and removal of message items.